EP2604382A1 - Tête de montage de broche d'une machine-outil - Google Patents

Tête de montage de broche d'une machine-outil Download PDF

Info

Publication number
EP2604382A1
EP2604382A1 EP12196605.5A EP12196605A EP2604382A1 EP 2604382 A1 EP2604382 A1 EP 2604382A1 EP 12196605 A EP12196605 A EP 12196605A EP 2604382 A1 EP2604382 A1 EP 2604382A1
Authority
EP
European Patent Office
Prior art keywords
supporting body
axis
tool holder
spindle
holder shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12196605.5A
Other languages
German (de)
English (en)
Other versions
EP2604382B1 (fr
Inventor
Maurizio Ferrari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jobs SpA
Original Assignee
Jobs SpA
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Filing date
Publication date
Application filed by Jobs SpA filed Critical Jobs SpA
Publication of EP2604382A1 publication Critical patent/EP2604382A1/fr
Application granted granted Critical
Publication of EP2604382B1 publication Critical patent/EP2604382B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/32—Feeding working-spindles
    • B23Q5/326—Feeding working-spindles screw-operated

Definitions

  • This invention relates to a spindle mounting head of a machine tool.
  • the machines of the above-mentioned type have spindle mounting heads, which are placed in rotation and at the same time moved in space along the three linear axes of a reference drive system.
  • these machines require a high degree of precision in the movement of the head along the axis substantially parallel to the relative axis of rotation in order to guarantee a high level of quality of the machining performed.
  • machines are known wherein the spindle mounting head is mounted on a guide, inside a supporting body of the head, for moving it parallel to its axis of rotation.
  • the supporting body has a main dimension of extension and the linear movement of the spindle is given by the actuation of a worm screw connected to the guide or to the head.
  • the rotation of the worm screw causes the movement of the spindle along a direction parallel to the main dimension of extension of the body and parallel to the axis of rotation of the worm screw.
  • the worm screw is actuated by a motor, the drive shaft of which is connected to the worm screw by belts or gear wheels, and the worm screw is therefore mounted "cantilever-style" relative to the motor.
  • a movement system of this type has numerous problems linked also with the lubrication of the components, which can lead to wear, even rapid, of the elements, and, therefore, to further clearances and imprecisions in the machining.
  • the motor for actuating the worm screw is mounted outside the above-mentioned body, and the machine is therefore characterised by large dimensions.
  • Machines wherein the motor for actuating the spindle is located close to the spindle itself.
  • the body has a main dimension of extension, if the motor for actuation of the spindle is mounted on an end of the body far from the end connected to the frame of the machine, inertias, vibrations and even bending of the body are created during movement of the spindle, such as to further adversely affect the execution of the machining.
  • machines are known wherein the motor for actuating the spindle is located at the end of the body connected to the frame of the machine.
  • the drive motor in order to transmit the motion to the spindle, the drive motor must be equipped with a very long drive shaft or a connecting shaft is also needed between the drive motor and the spindle having an equally high dimension of extension.
  • the aim of this invention is to provide a machine tool that overcomes the above mentioned drawbacks of the prior art.
  • a spindle mounting head of a machine tool comprising a supporting body with transversal dimensions, internally hollow and having an inner surface and connected to the machine at a first end; the head also has a hollow spindle connected to the supporting body, a tool holder shaft passing through the spindle and movable, along a second axis, between a first non-operating configuration, wherein the shaft is stationary and retracted inside the supporting body, and at least a second operating configuration, wherein the shaft is placed in rotation and moved along the second axis outside the supporting body.
  • the head comprises first first motor means, connected to the supporting body, for rotating the hollow spindle and the tool holder shaft and second motor means connected to the tool holder shaft for linearly moving the latter along the second axis; the second motor means having a relative third axis of motion transmission connected to the tool holder shaft.
  • the head is characterised in that the second motor means are located inside the transversal dimensions of the supporting body.
  • a spindle mounting head wherein the third axis of rotation of the motor of the second motor means is coaxial with the second axis of translation of the tool holder shaft.
  • the spindle mounting head is characterised in that the first motor means are located inside the body.
  • the head is characterised in that the second motor means are also located inside body.
  • the numeral 1 denotes in its entirety a machine tool, the frame of which is denoted with the numeral 2 and is illustrated only in part in the drawing.
  • the numeral 3 indicates, in general, a spindle mounting head of the machine according to this invention.
  • the spindle mounting head 3 comprises a supporting body (4) with transversal dimensions (d), internally hollow and having an inner surface (5).
  • transversal dimensions means not only the space occupied solely by the supporting body, but also the extension of the space itself, that is, the extension of the space along the direction identified by the first axis D.
  • the body 4 in particular, extends mainly along a first axis D. Moreover, the supporting body 4 is connected to the frame 2 of the machine 1 at a relative first end 6.
  • the body 4 has a substantially cylindrical shape.
  • the head 3 comprises a hollow spindle 8, of known type and therefore not described in detail here, supported by the body 4 at a second end 7.
  • supported means that the the spindle 8 is integrally connected to the supporting body 4 at the second end 7 and fixed in position.
  • the supporting body 4 is designed to support the spindle 8, at the second end 7, at the same time fixing the position.
  • the second end 7 is, relative to the body 4, opposite the first end 6 connected to the frame 2 of the machine 1.
  • the hollow spindle 8 is connected to the supporting body 4 by a pair of bearings, not illustrated, with the purpose of making the rotation of the spindle 8 smoother.
  • the hollow spindle 8 supports inside a tool holder shaft 9.
  • the tool holder shaft 9 is movable, along a second axis Z, between a first non-operating configuration ( Figure 1 ), wherein it is retracted inside the supporting body 4 and is stationary, and at least a second operating configuration at which the shaft 9 is placed in rotation and extracted from the supporting body 4 after being translated along the second axis Z towards the outside of the supporting body 4.
  • Figure 2 illustrates with a continuous line an intermediate extraction position which can reach the shaft 9, whilst a dashed line illustrates its position of maximum extraction from the supporting body 4.
  • the second axis Z is substantially parallel to the first axis D of main extension of the supporting body 4.
  • the tool holder shaft 9 is placed in rotation by first motor means 11 connected to the supporting body 4.
  • the first motor means 11 are connected directly to the hollow spindle 8, which in turn transmits the rotational motion to the tool holder shaft 9.
  • the spindle mounting head 3 also comprises second motor means 12 for linear translation of the tool holder shaft 9, along the second axis Z. More in detail, under operating conditions, the second motor means 12 translate only the tool holder shaft 9, since, as stated previously, the spindle 8 is connected integrally with the supporting body 4 and is fixed in position at the second end 7. In this way, the spindle 8 does not participate in the translation of the tool holder shaft 9, performed by the second motor means 12.
  • the second motor means 12 have a relative third axis W of motion transmission connected to the tool holder shaft 9.
  • the second motor means 12 are located inside the transversal dimensions of the supporting body 4.
  • the third axis W of the second motor means 12 is coaxial with the second axis Z of translation of the tool holder shaft 9.
  • the second motor means 12 comprise a worm screw 13, connected to the tool holder shaft 9, rotating about a fourth axis A, and such as to translate the tool holder shaft 9 when placed in rotation.
  • the second motor means 12 also comprise a motor 14, rotating about the third axis W, for rotating the worm screw 13, in such a way as to generate the translation of the tool holder shaft 9 along the second axis Z.
  • the second motor means 12 comprise a rod 27 connected to the tool holder shaft 9 and a tubular electric motor 28 for translating the rod 27. More in detail, the electric motor 28 operates on the rod 27 forming, similarly to the previous embodiment, a translation along the fourth axis A. Consequently, therefore, a translation of the rod 27 along the fourth axis A causes a translation of the shaft 9, connected to it, along the second axis Z.
  • the third axis W of rotation is coaxial with the fourth axis A of rotation. Moreover, the third axis W of rotation of the motor 14, the fourth axis A of rotation and the second axis Z of translation of the tool holder shaft 9 are coincident with each other
  • the above-mentioned tool holder shaft 9 is commonly known as "Quill”.
  • the "Quill” performs not only a translation, along the fourth axis A, but at the same time it is able to rotate to set the tool 10 in rotation and perform the machining.
  • the use of the "Quill" is particularly advantageous due to the degree of stability it is is able to give to the tool 10 during performance of the machining.
  • the hollow spindle 8 is connected to the first motor means 11 by a gear system 17, of a known type and therefore not described in further detail. More specifically, the gear system 17 is such as to simultaneously allow the rotation and translation of the tool holder shaft 9.
  • the first motor means 11 comprise a gear motor 18 for rotating the spindle 8 and a drive shaft 19, located at the outfeed of the gear motor 18 and connected to the spindle 8.
  • the drive shaft 19 is connected, at a first end 20, to the outfeed of the gear motor 18, whilst, at a second end 21 opposite the first end 20, it is connected to the gear system 17.
  • the gear system 17 is schematically shown in the drawing as a pair of a pair of gear wheels; a first wheel 22 is integral with the spindle 8 whilst a second wheel 23 is connected to the second end 21 of the drive shaft 19.
  • a first motor means 11 are located inside the supporting body 4.
  • the second motor means 12 are also located inside the supporting body 4.
  • the motor 14 of the second motor means 12 and the gear motor 18 of the first motor means 11 are integrally connected to the inner surface 5 of the supporting body 4.
  • the gear motor 18 is advantageously located inside the supporting body 4, in a substantially central position between the first end 6 and the second end 7 of the supporting body 4.
  • This positioning allows a drive shaft 19 to be used which is short compared with similar drive shafts used in prior art machines.
  • the gear motor 18 is positioned in the prior art very close to the first end 6 of the body 4, and therefore very close to the frame 2 of the machine 1.
  • the head 3 has means 24 for guiding the tool holder shaft 9, which accompany the shaft 9 during its translation and stabilise its position in any operating configuration.
  • the guide means 24 comprise a fixed linear guide 25 connected to the inner surface 5 of the supporting body 4, which is connected to the tool holder shaft 9.
  • the tool holder shaft 9 is coupled to the linear guide 25, using a slide, shown in the drawing with numeral 26.
  • the slide 26 is mounted on the tool holder shaft 9 and allows rotation of the shaft 9, during the translation, without there being interferences in the translation, for example with the movement of the worm screw 13 or of the rod 27.
  • the hollow spindle 8 is housed at least partly inside the supporting body 4, so as to have further reduced overall dimensions of the machine 1.
  • the machine 1 has fewer problems regarding lubrication and overheating.
  • the motor 14 of the second motor means 12 has, advantageously, lifelong lubrication, which allows longer operational periods and a reduction in the maintenance times and costs.
  • the adoption of a shorter drive shaft 19 makes the shaft 19, the spindle mounting head 3 and, therefore, the entire machine 1 less subject to inertias and bendings and also harmful overheating.
  • the head 3 as described is, furthermore, easy to maintain, since all the components inside the supporting body 4 are easy to reach and dismantle, as well as extract.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
  • Door And Window Frames Mounted To Openings (AREA)
  • Special Wing (AREA)
  • Wing Frames And Configurations (AREA)
EP12196605.5A 2011-12-12 2012-12-11 Tête de montage de broche d'une machine-outil Active EP2604382B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000705A ITBO20110705A1 (it) 2011-12-12 2011-12-12 Testa porta mandrino di una macchina utensile

Publications (2)

Publication Number Publication Date
EP2604382A1 true EP2604382A1 (fr) 2013-06-19
EP2604382B1 EP2604382B1 (fr) 2015-06-24

Family

ID=45614879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12196605.5A Active EP2604382B1 (fr) 2011-12-12 2012-12-11 Tête de montage de broche d'une machine-outil

Country Status (3)

Country Link
EP (1) EP2604382B1 (fr)
ES (1) ES2547914T3 (fr)
IT (1) ITBO20110705A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657310A (en) * 1947-05-05 1951-09-19 Const Electro Mecaniques De Sa Drilling machine
GB966565A (en) * 1961-05-03 1964-08-12 Wavis Engineering Dev Co Ltd Machine tools
US20050236169A1 (en) * 2004-04-24 2005-10-27 Xiao Ru S Machine tool having coaxial driving device
US20080232914A1 (en) * 2007-03-23 2008-09-25 The Boeing Company Drill Spindles with Inline Direct Drive Feed
EP1992436A1 (fr) * 2007-05-15 2008-11-19 Hüller Hille GmbH Broche principale motorisée pour une machine-outil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548711A (en) * 1968-11-14 1970-12-22 Cincinnati Milacron Inc Machine tool spindle apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB657310A (en) * 1947-05-05 1951-09-19 Const Electro Mecaniques De Sa Drilling machine
GB966565A (en) * 1961-05-03 1964-08-12 Wavis Engineering Dev Co Ltd Machine tools
US20050236169A1 (en) * 2004-04-24 2005-10-27 Xiao Ru S Machine tool having coaxial driving device
US20080232914A1 (en) * 2007-03-23 2008-09-25 The Boeing Company Drill Spindles with Inline Direct Drive Feed
EP1992436A1 (fr) * 2007-05-15 2008-11-19 Hüller Hille GmbH Broche principale motorisée pour une machine-outil

Also Published As

Publication number Publication date
ITBO20110705A1 (it) 2013-06-13
EP2604382B1 (fr) 2015-06-24
ES2547914T3 (es) 2015-10-09

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